Please note that cross compiling is not yet supported by clang (or at least, it is not easy to do out of the box). Quickstart Checkout head: # svn co http://svn.freebsd.org/base/head srcAdd the following lines to /etc/make.conf (if you want to use clang for everything, even ports), or /etc/src.conf (if you want to use clang just for world and kernel): CC=clang CXX=clang++ CPP=clang-cpp(NOTE: Do *n